表面活性剂提高页岩气井固井水泥浆的抗污染性能评价

Anti-pollution Performance Improvement of Shale Gas Well Cement Slurry by Surfactant

何冠羲 姜洪斌 梁悦 杨扬 韩龙

HE Guanxi JIANG Hongbin LIANG Yue YANG Yang HAN Long

采取水平井开发页岩气储层时，由于套管偏心以及井径不规则等原因，通常会导致油基钻井液的顶替效率 较低，部分油基钻井液掺入固井水泥浆中，影响水泥浆的性能。为了提高页岩气固井水泥浆的抗污染能力，室内 将非离子表面活性剂与阴离子表面活性剂复配制得表面活性剂（AFSG-1），然后以现场油基钻井液和固井水泥 浆为研究对象，开展了AFSG-1 提高页岩气井固井水泥浆抗污染性能的研究。结果表明，现场油基钻井液的掺入 会严重影响固井水泥浆的流动度、稠化时间以及混浆水泥石性能；油基钻井液的掺入比例越大，污染越严重。随 着固井水泥浆中AFSG-1 加量的不断增大，水泥浆自身的抗污染能力逐渐增强；当固井水泥浆中AFSG-1 的质量 分数为2%时，再掺入20%的油基钻井液，混浆的流动度、稠化时间以及水泥石性能与未加表面活性剂时相比均 有明显改善。另外，AFSG-1 对固井水泥浆抗油基钻井液污染性能的改善效果明显优于其他常用表面活性剂。 AFSG-1 能有效提高页岩气固井水泥浆抗油基钻井液污染的能力，可提高固井质量，保障固井安全。

When shale gas reservoir is developed by horizontal wells，due to casing eccentricity and irregular diameter，the displacement efficiency of oil-based drilling fluid is usually low. Some oil-based drilling fluid is mixed into cement slurry，which affects the performance of cement slurry. In order to improve the anti-pollution ability of shale gas cementing cement slurry，the surfactant （AFSG-1） was prepared by mixing non-ionic surfactant and anionic surfactant in the laboratory. The research on improving the anti-pollution performance of shale gas well cementing cement slurry by AFSG-1 was carried out with the field oil-based drilling fluid and cementing cement slurry as the research object. The results showed that the addition of oil-based drilling fluid in the field would seriously affect the fluidity，thickening time and mud-mixed water and debris properties of cement slurry. The greater the proportion of oil-based drilling fluid，the more serious the pollution was. With the increasing amount of AFSG-1 in cement slurry，the anti-pollution ability of cement slurry was gradually enhanced. When the mass fraction of AFSG-1 in cement slurry was 2%，and then 20% oil-based drilling fluid was added，the fluidity，thickening time and cement stone properties of the slurry were significantly improved compared with those without surfactant. In addition， the anti-pollution performance improvement effect of AFSG-1 on oil-based drilling fluid of cement slurry was significantly better than that of other commonly used surfactants. AFSG-1 could effectively improve the ability of shale gas cement slurry to resist the pollution of oil-based drilling fluid， improve the cementing quality and ensure the cementing safety.

10.19346/j.cnki.1000-4092.2023.01.006